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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d2646ad911de93788614c23d33eb6d8d33d087d9a6e93f639797086ed12d8b' 
  AND token = 'JEbVCjj/NvRj2W2u8yiMrVTWdvY244Ps2kCXur/Zlak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}